The tapetum lucidum is a key adaptation to
A. visual function in the deep sea.
B. visual function in fast moving predators.
C. visual function in brightly lit shallow marine waters.
D. visual function in prey species that require wide fields of vision.
E. visual sensitivity in nocturnally active animals.
E. visual sensitivity in nocturnally active animals.
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Active transport occurs ________ the concentration gradient across a cell membrane.
A. against B. towards C. away from D. in between E. passively against
What evidence do we have that the orbits of the asteroids are modified by the gravitational influences of the planets?
What will be an ideal response?
Primary carnivores are
a. primary consumers. b. secondary consumers. c. tertiary consumers. d. primary producers. e. secondary producers.
Darwin studied and wrote extensively about the mechanism known as artificial selection. Artificial selection is similar to natural selection, except that ________
A) natural selection works toward a specific goal B) artificial selection relies on preexisting variations in populations; natural selection does not C) artificial selection produces varieties that would be less likely be favored in nature D) artificial selection produces varieties of less interest to humans than natural selection